The Blues thrashed Maccabi Telv Aviv 4-0 at Stamford Bridge in their opening group game to lay down a marker in the competition.
Mourinho has had a trying start to the season, but he saw his side bounce back in style after going down 3-1 to Everton last weekend in the Premier League.
"I am happy with the result and the performance. The same way I was not in hell with bad results, I am not in heaven we won a game," Mourinho told BT Sport.
"It was a good victory, you could see from minute one we were going to win the game.
"Missing the penalty was a good thing to test the team, we must be really strong to believe and the players have played very well, they showed a good attitude, good with the ball, it was a good victory.
"Good individual performance helps the players' self esteem and confidence, good collective performances are also good.
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"I know some experts will say Maccabi are not a top team, I agree, but they are a Champions League team and to beat a team you need to play well and we played well.
"We were good in the different phases of the game."
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